Search for the exotic Θ+ resonance in the NOMAD experiment

O. Samoylov; D. Naumov; V. Cavasinni; P. Astier; D. Autiero; A. Baldisseri; M. Baldo-Ceolin; M. Banner; G. Bassompierre; K. Benslama; N. Besson; I. Bird; B. Blumenfeld; F. Bobisut; J. Bouchez; S. Boyd; A. Bueno; S. Bunyatov; L. Camilleri; A. Cardini; P.W. Cattaneo; A. Cervera-Villanueva; R. Challis; A. Chukanov; G. Collazuol; G. Conforto; C. Conta; M. Contalbrigo; R. Cousins; D. Daniels; H. Degaudenzi; T. Del Prete; A. De Santo; T. Dignan; L. Di Lella; E. do Couto e Silva; J. Dumarchez; M. Ellis; G.J. Feldman; R. Ferrari; D. Ferrère; V. Flaminio; M. Fraternali; J.-M. Gaillard; E. Gangler; A. Geiser; D. Geppert; D. Gibin; S. Gninenko; A. Godley; J.-J. Gomez-Cadenas; J. Gosset; C. Gößling; M. Gouanère; A. Grant; G. Graziani; A. Guglielmi; C. Hagner; J. Hernando; D. Hubbard; P. Hurst; N. Hyett; E. Iacopini; C. Joseph; F. Juget; N. Kent; M. Kirsanov; O. Klimov; J. Kokkonen; A. Kovzelev; A. Krasnoperov; S. Lacaprara; C. Lachaud; B. Lakić; A. Lanza; L. La Rotonda; M. Laveder; A. Letessier-Selvon; J.-M. Levy; L. Linssen; A. Ljubičić; J. Long; A. Lupi; V. Lyubushkin; A. Marchionni; F. Martelli; X. Méchain; J.-P. Mendiburu; J.-P. Meyer; M. Mezzetto; S.R. Mishra; G.F. Moorhead; P. Nédélec; Y. Nefedov; C. Nguyen-Mau; D. Orestano; F. Pastore; L.S. Peak; E. Pennacchio; H. Pessard; R. Petti; A. Placci; G. Polesello; D. Pollmann; A. Polyarush; C. Poulsen; B. Popov; L. Rebuffi; J. Rico; P. Riemann; C. Roda; A. Rubbia; F. Salvatore; K. Schahmaneche; B. Schmidt; T. Schmidt; A. Sconza; M. Sevior; D. Sillou; F.J.P. Soler; G. Sozzi; D. Steele; U. Stiegler; M. Stipčević; Th. Stolarczyk; M. Tareb-Reyes; G.N. Taylor; V. Tereshchenko; A. Toropin; A.-M. Touchard; S.N. Tovey; M.-T. Tran; E. Tsesmelis; J. Ulrichs; L. Vacavant; M. Valdata-Nappi; V. Valuev; F. Vannucci; K.E. Varvell; M. Veltri; V. Vercesi; G. Vidal-Sitjes; J.-M. Vieira; T. Vinogradova; F.V. Weber; T. Weisse; F.F. Wilson; L.J. Winton; B.D. Yabsley; H. Zaccone; K. Zuber; P. Zuccon

doi:10.1140/epjc/s10052-006-0080-y

2022 Impact factor 4.4

Particles and Fields

Eur. Phys. J. C (2007) 49: 499-510
https://doi.org/10.1140/epjc/s10052-006-0080-y

Regular Article - Experimental Physics

Search for the exotic Θ⁺ resonance in the NOMAD experiment

O. Samoylov⁶, D. Naumov⁶^,7^*, V. Cavasinni¹⁶, P. Astier¹⁴, D. Autiero⁸, A. Baldisseri¹⁸, M. Baldo-Ceolin¹³, M. Banner¹⁴, G. Bassompierre¹, K. Benslama⁹, N. Besson¹⁸, I. Bird⁸^,9, B. Blumenfeld², F. Bobisut¹³, J. Bouchez¹⁸, S. Boyd²⁰, A. Bueno³^,24, S. Bunyatov⁶, L. Camilleri⁸, A. Cardini¹⁰, P.W. Cattaneo¹⁵, A. Cervera-Villanueva⁸^,22, R. Challis¹¹, A. Chukanov⁶, G. Collazuol¹³, G. Conforto⁸^,21, C. Conta¹⁵, M. Contalbrigo¹³, R. Cousins¹⁰, D. Daniels³, H. Degaudenzi⁹, T. Del Prete¹⁶, A. De Santo⁸^,16, T. Dignan³, L. Di Lella⁸, E. do Couto e Silva⁸, J. Dumarchez¹⁴, M. Ellis²⁰, G.J. Feldman³, R. Ferrari¹⁵, D. Ferrère⁸, V. Flaminio¹⁶, M. Fraternali¹⁵, J.-M. Gaillard¹, E. Gangler⁸^,14, A. Geiser⁵^,8, D. Geppert⁵, D. Gibin¹³, S. Gninenko⁸^,12, A. Godley¹⁹, J.-J. Gomez-Cadenas⁸^,22, J. Gosset¹⁸, C. Gößling⁵, M. Gouanère¹, A. Grant⁸, G. Graziani⁷, A. Guglielmi¹³, C. Hagner¹⁸, J. Hernando²², D. Hubbard³, P. Hurst³, N. Hyett¹¹, E. Iacopini⁷, C. Joseph⁹, F. Juget⁹, N. Kent¹¹, M. Kirsanov¹², O. Klimov⁶, J. Kokkonen⁸, A. Kovzelev¹²^,15, A. Krasnoperov¹^,6, S. Lacaprara¹³, C. Lachaud¹⁴, B. Lakić²³, A. Lanza¹⁵, L. La Rotonda⁴, M. Laveder¹³, A. Letessier-Selvon¹⁴, J.-M. Levy¹⁴, L. Linssen⁸, A. Ljubičić²³, J. Long², A. Lupi⁷, V. Lyubushkin⁶, A. Marchionni⁷, F. Martelli²¹, X. Méchain¹⁸, J.-P. Mendiburu¹, J.-P. Meyer¹⁸, M. Mezzetto¹³, S.R. Mishra³^,19, G.F. Moorhead¹¹, P. Nédélec¹, Y. Nefedov⁶, C. Nguyen-Mau⁹, D. Orestano¹⁷, F. Pastore¹⁷, L.S. Peak²⁰, E. Pennacchio²¹, H. Pessard¹, R. Petti⁸^,15, A. Placci⁸, G. Polesello¹⁵, D. Pollmann⁵, A. Polyarush¹², C. Poulsen¹¹, B. Popov⁶^,14, L. Rebuffi¹³, J. Rico²⁴, P. Riemann⁵, C. Roda⁸^,16, A. Rubbia⁸^,24, F. Salvatore¹⁵, K. Schahmaneche¹⁴, B. Schmidt⁵^,8, T. Schmidt⁵, A. Sconza¹³, M. Sevior¹¹, D. Sillou¹, F.J.P. Soler⁸^,20, G. Sozzi⁹, D. Steele²^,9, U. Stiegler⁸, M. Stipčević²³, Th. Stolarczyk¹⁸, M. Tareb-Reyes⁹, G.N. Taylor¹¹, V. Tereshchenko⁶, A. Toropin¹², A.-M. Touchard¹⁴, S.N. Tovey⁸^,11, M.-T. Tran⁹, E. Tsesmelis⁸, J. Ulrichs²⁰, L. Vacavant⁹, M. Valdata-Nappi⁴, V. Valuev⁶^,10, F. Vannucci¹⁴, K.E. Varvell²⁰, M. Veltri²¹, V. Vercesi¹⁵, G. Vidal-Sitjes⁸, J.-M. Vieira⁹, T. Vinogradova¹⁰, F.V. Weber³^,8, T. Weisse⁵, F.F. Wilson⁸, L.J. Winton¹¹, B.D. Yabsley²⁰, H. Zaccone¹⁸, K. Zuber⁵, P. Zuccon¹³ and The Nomad Collaboration

¹ LAPP, Annecy, France
² Johns Hopkins Univ., Baltimore, MD, USA
³ Harvard Univ., Cambridge, MA, USA
⁴ Univ. of Calabria and INFN, Cosenza, Italy
⁵ Dortmund Univ., Dortmund, Germany
⁶ JINR, Dubna, Russia
⁷ Univ. of Florence and INFN, Florence, Italy
⁸ CERN, Geneva, Switzerland
⁹ University of Lausanne, Lausanne, Switzerland
¹⁰ UCLA, Los Angeles, CA, USA
¹¹ University of Melbourne, Melbourne, Australia
¹² Inst. for Nuclear Research, INR Moscow, Moscow, Russia
¹³ Univ. of Padova and INFN, Padova, Italy
¹⁴ LPNHE, Univ. of Paris VI and VII, Paris, France
¹⁵ Univ. of Pavia and INFN, Pavia, Italy
¹⁶ Univ. of Pisa and INFN, Pisa, Italy
¹⁷ Roma Tre University and INFN, Rome, Italy
¹⁸ DAPNIA, CEA Saclay, Saclay, France
¹⁹ Univ. of South Carolina, Columbia, SC, USA
²⁰ Univ. of Sydney, Sydney, Australia
²¹ Univ. of Urbino and INFN Florence, Urbino, Italy
²² IFIC, Valencia, Spain
²³ Rudjer Bošković Institute, Zagreb, Croatia
²⁴ ETH Zürich, Zürich, Switzerland

^* e-mail: naumov@nusun.jinr.ru

Received: 4 July 2006
Published online: 24 October 2006

Abstract

A search for exotic Θ⁺ baryon via Θ⁺→p+K⁰ _S decay mode in the NOMAD ν_μN data is reported. The special background generation procedure was developed. The proton identification criteria are tuned to maximize the sensitivity to the Θ⁺ signal as a function of x_F which allows to study the Θ⁺ production mechanism. We do not observe any evidence for the Θ⁺ state in the NOMAD data. We provide an upper limit on Θ⁺ production rate at 90% CL as 2.13×10^-3 per neutrino interaction.